So here's a thing
I was thinking about the nature of Youth Subcultures and often found the view that "it all began with the Sixties/Elvis/The Beatles/Teenagers" (delete to taste)
Being a contrarian I thought I'd track back to see if youth subculture existed before that (it did)
As ever, Wikipedia provided a great reference source both explaining each subculture (with cross links to antecedents and later subcultures it influenced) and also cataloguing the most important ones here :http://en.wikipedia.org/wiki/History_of_subcultures_in_the_20th_century
I then fancied going forward in time to see where some of today's youth subcultures emerged from and then couldn't resist trying to map it out. I tried to use the Wikipedians catalogue and their views on who influenced whom but inevitably some of my own biases will have crept in.
It's also very Anglo-American but then it is based on analysing cross links in the English Language version of Wikipedia.
Anyhow, enjoy the map Download Youth Subculture map 2 .
::: just found that someone had done a (better) version of this already